Update DecSm.Atom.Module.AzureKeyVault/AzureKeySecretsProvider.cs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: DecSmith42

DecSm.Atom.Module.AzureKeyVault/AzureKeySecretsProvider.cs

@@ -189,7 +189,9 @@ private TokenCredential GetCredential(IAzureKeyVault definition)
 
         var port = buildDefinition.AccessParam(nameof(IAzureKeyVault.AzureVaultAuthPort)) switch
         {
-            string portString => int.Parse(portString),
+            string portString => int.TryParse(portString, out var parsedPort)
+                ? parsedPort
+                : throw new InvalidOperationException($"Invalid port value for AzureVaultAuthPort: '{portString}'. Please provide a valid integer."),
             int portInt => portInt,
             _ => 0,
         };